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- Title
Prediction of Critical Power and W' in Hypoxia: Application to Work-Balance Modelling.
- Authors
Townsend, Nathan E.; Nichols, David S.; Skiba, Philip F.; Racinais, Sebastien; Périard, Julien D.
- Abstract
Purpose: Develop a prediction equation for critical power (CP) and work above CP (W') in hypoxia for use in the work-balance (W' BAL) model. Methods : Nine trained male cyclists completed cycling time trials (TT; 12, 7, and 3 min) to determine CP and W' at five altitudes (250, 1,250, 2,250, 3,250, and 4,250 m). Least squares regression was used to predict CP and W' at altitude. A high-intensity intermittent test (HIIT) was performed at 250 and 2,250 m. Actual and predicted CP and W' were used to compute W' during HIIT using differential (W' BALdiff) and integral (W' BALint) forms of the W' BAL model. Results : CP decreased at altitude (P < 0.001) as described by 3rd order polynomial function (R2 = 0.99). W' decreased at 4,250m only (P < 0.001). A double-linear function characterized the effect of altitude on W' (R2 = 0.99). There was no significant effect of parameter input (actual vs. predicted CP and W') on modelled W' BAL at 2,250m (P = 0.24). W' BALdiff returned higher values than W' BALint throughout HIIT (P < 0.001). During HIIT, W' BALdiff was not different to 0 kJ at completion, at 250m (0.7 ± 2.0 kJ; P = 0.33) and 2,250m (-1.3 ± 3.5 kJ; P = 0.30). However, W' BALint was lower than 0 kJ at 250m (-0.9 ± 1.3 kJ; P = 0.058) and 2,250m (-2.8 ± 2.8 kJ; P = 0.02). Conclusion: The altitude prediction equations for CP and W' developed in this study are suitable for use with the W' BAL model in acute hypoxia. This enables the application of W'BAL modelling to training prescription and competition analysis at altitude.
- Subjects
HYPOXEMIA; ISOTONIC regression; NUMERICAL analysis; HUMAN behavior; LOGICAL prediction
- Publication
Frontiers in Physiology, 2017, Vol 8, p1
- ISSN
1664-042X
- Publication type
Article
- DOI
10.3389/fphys.2017.00180